from django.shortcuts import render
from .models import Post
from django.shortcuts import render, get_object_or_404
from django.core.paginator import Paginator, EmptyPage,PageNotAnInteger
from django.core.mail import send_mail
from .forms import EmailPostForm
from .forms import EmailPostForm, CommentForm
from taggit.models import Tag
from django.db.models import Count
from django.contrib.postgres.search import SearchVector
from .forms import EmailPostForm, CommentForm, SearchForm
def post_list(request, tag_slug=None):
  posts = Post.published.all()
  tag = None
  if tag_slug:
    tag = get_object_or_404(Tag, slug=tag_slug)
    posts = posts.filter(tags=tag)
  paginator = Paginator(posts, 3)
  page = request.GET.get('page')
  try:
    posts = paginator.page(page)
  except PageNotAnInteger:
    posts = paginator.page(1)
  except EmptyPage:
    posts = paginator.page(paginator.num_pages)
  return render(request, 'blog/post/list.html', {'posts': posts, 'page':page,'tag': tag})



def post_detail(request, year, month, day, post):
  post = get_object_or_404(Post, slug=post, status='published',
                            publish__year=year,
                            publish__month=month,
                            publish__day=day)
  comments = post.comments.filter(active=True)
  new_comment = None
  if request.method == 'POST':
    comment_form = CommentForm(data=request.POST)
    if comment_form.is_valid():
        new_comment = comment_form.save(commit=False)
        new_comment.post = post
        new_comment.save()
  else:
    comment_form = CommentForm()
  post_tags_ids = post.tags.values_list('id', flat=True)
  similar_posts = Post.published.filter(tags__in=post_tags_ids)\
 .exclude(id=post.id)
  similar_posts = similar_posts.annotate(same_tags=Count('tags'))\
 .order_by('-same_tags','-publish')[:4]
  return render(request,'blog/post/detail.html',{'post': post,'comments': comments,'new_comment': new_comment,'comment_form': comment_form,'similar_posts': similar_posts})

def post_share(request, post_id):
  post = get_object_or_404(Post, id=post_id, status='published')
  sent = False
  if request.method == 'POST':
    form = EmailPostForm(request.POST)
    if form.is_valid():
      cd = form.cleaned_data
      post_url =request.build_absolute_uri(post.get_absolute_url())
      subject = f"{cd['name']} recommends you read " \
      f"{post.title}"
      message = f"Read {post.title} at {post_url}\n\n" \
      f"{cd['name']}\'s comments: {cd['comments']}"
      send_mail(subject, message, '3229650964@qq.com', [cd['to']])

      sent = True
  else:
      form = EmailPostForm()
  return render(request, 'blog/post/share.html', {'post': post,'form': form,'sent': sent})

def post_search(request):
  form = SearchForm()
  query = None
  results = []
  if 'query' in request.GET:
    form = SearchForm(request.GET)
    if form.is_valid():
      query = form.cleaned_data['query']
      results = Post.published.annotate(
        search=SearchVector('title', 'body')
        ).filter(search=query)
  return render(request,'blog/post/search.html', {'form': form,'query': query,'results': results})

